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道砟即使在低围压下也会产生颗粒破碎,从而改变其原始级配。级配作为道砟的一个重要物理特性,显著地影响着道砟本身物理、力学特性。建立可以反映颗粒破碎引起级配演变的本构模型至关重要。基于Einav的分形破碎指标和土体边界面塑性理论,通过分析道砟三轴试验结果,尝试建立了低围压下可以反映颗粒破碎引起级配演变的道砟边界面本构模型。与试验结果对比发现:模型可以较好地反映道砟在低围压下的应力-应变特性;同时,可以对加载过程中颗粒破碎引起的级配演变进行合理的预测。
Road 砟 even under low confining pressure will produce particle crushing, thus changing its original level. Gradation, as an important physical property of Dao, has a significant impact on the physical and mechanical properties of Dao. It is of crucial importance to establish a constitutive model that reflects the gradation evolution caused by particle fragmentation. Based on Einav ’s fractal and fragmentation index and the soil interface plasticity theory, this paper tries to establish the boundary model of the boundary surface of the road surface, which can reflect the gradation evolution caused by particle crushing under low confining pressure, by analyzing the results of triaxial tests. Compared with the experimental results, it is found that the model can better reflect the stress-strain behavior of Road 砟 under low confining pressure, and at the same time it can reasonably predict the gradation evolution caused by particle breakage during loading.